Got no problem with dependencies -- I think webkit would work fine on the Q7, given that it comes with Midori. xulrunner won't even install, however...
XULrunner's certainly an easy way in, just not particularly elegant or light.
Personally, I'd like to see someone use the dillo renderer (especially as they're finally starting to support CSS.) It's super-fast and extremely light.
I'm sure there are other lightweight engines, too. Anyway, I'm glad to see a standalone ePub reader for Linux -- hope more come soon.
m a r